I want to create an extension function that is using the `apply{}` function inside. Like: ```fun Foo...

# getting-started

[Vitali Plagov]

I want to create an extension function that is using the apply{} function inside. Like:

fun Foo.myFun() {
  bar.apply {
    this.doA()
    this.doB()
    this.doC()
  }
}

this here refers to the type of bar, not to the type of Foo
How can I use the instance of Foo inside the bar.apply{}?

[Joffrey]

You can use the labeled syntax this@myFun to refer to the receiver of the function. But this is only necessary if there is an ambiguity. You can also not use this at all and simply call the methods/properties of Foo directly

[Vitali Plagov]

Thanks! Didn’t that I can call functions of Foo w/o specifying this explicitly

[Joffrey]

Yep, in Kotlin in general (like in Java) using this is optional, unlike in JS. It's only necessary when there is ambiguity